A pneumatic sample transport device based on deceleration and positioning

Abstract

The present invention discloses a pneumatic sample transport device based on deceleration and positioning, the device consists of a positioning component and a deceleration component; the positioning component comprises a U-shaped rabbit pipe with an opening downward and one end as a starting end and the other end as a destination end, and a sample transport device arranged in the U-shaped rabbit pipe and transporting target materials from one end to the other end; the U-shaped rabbit pipe and the sample transport device are respectively provided with magnets that attract each other, the deceleration component comprises a ventilation component arranged at the starting end of the U-shaped rabbit pipe, a deceleration component arranged at the destination end of the U-shaped rabbit pipe, and a plurality of sensor components arranged in the bend of the U-shaped rabbit pipe. The present invention decelerates the sample transport device through a control system and positions the sample transport device through the principle of magnetic attraction, thereby avoiding damage to the sample transport device and the contained sample due to severe impact, and improving automation and reducing the difficulty of manipulator design through automatic positioning of the sample transport device.

Description

Technical Field

[0001] The invention belongs to the technical field of medical radioisotopes, and in particular designs a pneumatic sample transport device based on deceleration and positioning. Background Art

[0002] Medical radioactive isotopes are widely used in medical diagnosis and treatment. There are few natural radionuclides in nature, so most medical radioactive isotopes are artificially manufactured, such as accelerator production, reactor production, and isotope generator production. Among them, both accelerator and reactor production methods bombard various target materials with high-energy beams to obtain the target nuclides. The target material is generally transferred from the hot chamber to the target chamber for irradiation, and then returned to the hot chamber for decomposition and purification after irradiation. At present, most of the targets are transported by pneumatic transmission.

[0003] The difficulties of using pneumatic means to transport target materials are: The first difficulty: uncertainty caused by the high speed of pneumatic transmission: the speed of pneumatic transmission is often fast, and the sample transport device often encounters a violent collision when it reaches the target chamber, which brings uncertainty; the second difficulty: the freely rotating target sample transport device does not correspond to the position of the manipulator when it reaches the target point: because the sample transport device holding the target material can rotate freely during pipeline transmission, the position is uncertain each time it arrives at the target chamber, while the position of the manipulator that grabs the target material is fixed. Therefore, the freely rotating target sample transport device in the sample transport device must be repositioned when it arrives at the target chamber, so that the target material in the sample transport device faces the direction facing the manipulator, so that the manipulator can complete the operation of grabbing the target material and putting it back after irradiation according to the planned procedure. Eliminate radiation safety hazards caused by manual operation. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a pneumatic sample transport device based on deceleration and positioning, with the aim of solving the uncertainty caused by the fast pneumatic transmission speed during the target material startup transmission process, and the problem that the freely rotating target sample transport device 3 does not correspond to the orientation of the robot when it reaches the target point.

[0005] The present invention proposes the following technical solutions to solve the technical problems:

[0006] A pneumatic sample transport device based on deceleration and positioning, characterized in that: the device consists of a positioning component and a deceleration component; the positioning component comprises a U-shaped rabbit pipe with an opening downward, one end as a starting end and the other end as a destination end, and a sample transport device arranged in the U-shaped rabbit pipe and transporting target materials from one end to the other end; the U-shaped rabbit pipe and the sample transport device are respectively provided with magnets that attract each other, and the positioning of the sample transport device is completed under the action of magnetic force; the deceleration component comprises a ventilation component arranged at the starting end of the U-shaped rabbit pipe, a deceleration component arranged at the destination end of the U-shaped rabbit pipe, and a plurality of sensor components arranged in the bend of the U-shaped rabbit pipe, and process control is realized through the organic cooperation of the ventilation component, the deceleration component, and the plurality of sensor components, so as to achieve the purpose of deceleration and collision avoidance.

[0007] Furthermore, the U-shaped rabbit pipe and the sample transport device are respectively provided with magnets that attract each other, specifically: there is an S-pole magnet and an N-pole magnet on both sides of the starting end and the destination end of the U-shaped rabbit pipe, respectively, and there is an upper SN magnet and a lower SN magnet at the upper and lower ends of the sample transport device; the S pole of the sample transport device will be close to the N pole at the starting end or the destination end of the U-shaped rabbit pipe, and the N pole of the sample transport device will be close to the S pole at the starting end or the destination end of the U-shaped rabbit pipe, thereby completing the positioning of the sample transport device, and the positioning is that when the sample transport device reaches the destination from the starting end of the U-shaped rabbit pipe, its groove is opposite to the opening of the U-shaped rabbit pipe, thereby facilitating the operation of the robot to take and place the target material.

[0008] Furthermore, the ventilation assembly includes an air pressure chamber arranged below the starting end of the U-shaped rabbit running pipe for ventilating the sample transport device, a transmission retaining spring, and a detection signal and a detection signal; when the sample transport device is in the air pressure chamber position, the detection signal and the signal feedback lights of the detection signal are always on, indicating that the sample transport device is in the position of the air pressure chamber and has been positioned; when the air pressure chamber is ventilated, the sample transport device starts from the air pressure chamber end of the U-shaped rabbit running pipe. At this time, the detection signal and the signal feedback lights of the detection signal are off, indicating that the sample transport device starts normally.

[0009] Further, the deceleration component includes: an air pressure chamber arranged below the destination end of the U-shaped rabbit running pipeline for decelerating the sample transport device, a transmission clip, and a detection signal and a detection signal; the multiple sensor components include: a detection signal, a detection signal, a detection signal, and a detection signal arranged at intervals in the bend of the U-shaped rabbit running pipeline;

[0010] A passing signal is sent through the detection signal, indicating that the sample transport device passes the curve normally; when the sample transport device passes the detection signal, a passing signal is sent, and the air pressure chamber stops ventilating, and the sample transport device will continue to move under inertia; when the sample transport device passes the detection signal, a passing signal is sent, and the air pressure chamber gives the falling sample transport device an upward airflow, and the upward airflow further decelerates the sample transport device 3 until it lands on the buffer seat formed by the buffer spring. At this time, the detection signal detects that the sample transport device has arrived, and its corresponding feedback light is on, and the air pressure chamber stops ventilating; then the sample transport device starts to rotate under the joint action of the external magnetic field at the landing end and the magnet in the sample transport device 3 until it stops. At this time, the detection signal feedback light is on, indicating that the positioning is completed, and the next manipulator operation can be performed.

[0011] Furthermore, in order to prevent the sample transport device from getting stuck in the U-shaped rabbit running pipe, the feedback signals can be used to determine where the sample transport device is stuck, thereby reducing the maintenance processing time, and when the sample transport device is stuck when moving from one air pressure chamber to another, the sample transport device is withdrawn for maintenance by controlling the air pressure chamber to cut off and the air pressure chamber to ventilate; conversely, when moving from one air pressure chamber to another, the sample transport device is withdrawn for maintenance by controlling the air pressure chamber to cut off and the air pressure chamber to ventilate.

[0012] Furthermore, the sample transport device is cylindrical, and an upper SN magnet and a lower SN magnet are respectively provided on the upper end face and the lower end face of the cylindrical sample transport device. An opening is provided on the side of the cylindrical sample transport device, and the size of the opening matches the size of the target material storage box. The target material storage box is arranged in the middle of the cylindrical sample transport device, and the upper and lower ends of the target material storage box are blocked by spring blocking pins to prevent the target material from overflowing.

[0013] Advantages and effects of the present invention

[0014] The present invention proposes a method for decelerating and positioning a pneumatic sample transport device, which decelerates the sample transport device 3 through a control system and positions the sample transport device through the magnetic attraction principle. The advantages of this invention are as follows:

[0015] 1. Avoid damage to the sample transport device and the samples contained therein due to severe impact: Driven by the high-pressure airflow, the sample transport device moves at a faster speed, and the position information of the sample transport device is timely fed back through multiple detection signals on the transport pipeline, thereby controlling the stop of the driving airflow. The sample transport device can only move forward by inertia, and open the airflow at the receiving end, thereby giving the sample transport device a reverse airflow to achieve the purpose of deceleration, avoiding damage to the equipment, sample transport device 3, and samples due to severe impact.

[0016] 2. Improve maintenance efficiency: Because the detection signal installed on the pipeline can provide timely feedback on the location of the sample transport device, when the sample transport device 3 suddenly stops, its position can be determined in time and it can be retracted by reverse ventilation, avoiding manual maintenance, improving maintenance efficiency, and reducing radiation risks.

[0017] 3. Improved economic benefits: The deceleration of the sample transport device avoids damage to related equipment due to collision, increases the service life of the equipment, reduces the generation rate of nuclear waste, and reduces the cost of nuclear waste treatment. Through the automatic positioning of the sample transport device, the automation is improved, the operation of the manipulator is convenient, the degree of freedom of the manipulator is reduced, the accuracy is higher, and the difficulty of manipulator design is reduced, thereby reducing the design cost and manufacturing cost.

[0018] 4. Improved safety: The deceleration of the sample transport device 3 avoids damage to related equipment due to collision, increases the service life of the equipment, reduces the generation rate of nuclear waste, and reduces the number and duration of workers entering the radiation environment. The automatic positioning of the sample transport device 3 improves automation, avoids manual operation, and reduces radiation risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of magnet positioning of the present invention;

[0020] Figure 2 This is a schematic diagram of the pneumatic transport composition of the present invention;

[0021] In the figure, 1: starting end air pressure chamber; 2: first transmission buffer spring; 3: sample transport device; 4: first detection signal; 5: second detection signal; 6: third detection signal; 7: fourth detection signal; 8: second transmission buffer spring; 9: destination end air pressure chamber; 10: U-shaped rabbit running pipe; 11: upper SN magnet; 12: lower SN magnet; 13: S pole magnet; 14: N pole magnet; 15: fifth detection signal; 16: sixth detection signal; 17: seventh detection signal; 18: eighth detection signal; 19: transported target material; 20: spring blocking pin 20. DETAILED DESCRIPTION

[0022] Design principle of the present invention

[0023] Innovations of the present invention:

[0024] One of the innovations is the combination of fast pneumatic transmission and decelerated pneumatic transmission.

[0025] Three quarters of the U-shaped rabbit running pipe is used for rapid pneumatic transmission, and one quarter of the U-shaped rabbit running pipe is used for deceleration pneumatic transmission; in the deceleration pneumatic transmission area, the air cut-off of the air pressure chamber 1 at the ventilation starting end and the air supply of the air pressure chamber 9 at the destination end are combined, and the gravity and the reverse thrust airflow of the air pressure chamber 9 at the destination end are combined, thereby achieving the purpose of deceleration and avoiding damage to the equipment, sample transport device 3, and samples due to severe impact.

[0026] The second innovation is that magnetic positioning replaces conventional mechanical positioning or electric positioning. There are thousands of conventional positioning methods, but they all belong to the category of mechanical positioning or electric positioning. The present invention utilizes the principle of opposites attracting each other, and uses magnetic positioning of the sample transport device 3 at both ends of the starting point and the target point of the U-shaped rabbit running pipe 10 to replace the positioning of the sample transport device 3 during transportation, thereby avoiding the complex positioning control of the sample transport device 3 during transportation, simplifying the design and greatly reducing the production cost.

[0027] Based on the above invention principles, the present invention designs a pneumatic sample transport device 3 based on deceleration and positioning, which is characterized in that: the device consists of a positioning component and a deceleration component; the positioning component includes a U-shaped rabbit pipe 10 with an opening downward and one end as a starting end and the other end as a destination end, and a sample transport device 3 arranged in the U-shaped rabbit pipe 10 to transport the target material from one end to the other end; magnets that attract each other are respectively provided on the U-shaped rabbit pipe 10 and the sample transport device 3, and the positioning of the sample transport device 3 is completed under the action of magnetic force; the deceleration component includes a ventilation component arranged at the starting end of the U-shaped rabbit pipe 10, a deceleration component arranged at the destination end of the U-shaped rabbit pipe 10, and a plurality of sensor components arranged in the bend of the U-shaped rabbit pipe 10. Through the organic cooperation of the ventilation component, the deceleration component, and the plurality of sensor components, process control is realized to achieve the purpose of deceleration and collision avoidance.

[0028] Furthermore, the U-shaped rabbit pipe 10 and the sample transport device 3 are respectively provided with magnets that attract each other, specifically: there is an S-pole magnet 13 and an N-pole magnet 14 on both sides of the starting end and the destination end of the U-shaped rabbit pipe 10, respectively, and there is an upper SN magnet 11 and a lower SN magnet 12 at the upper and lower ends of the sample transport device 3; the S pole of the sample transport device 3 will be close to the N pole at the starting end or the destination end of the U-shaped rabbit pipe 10, and the N pole of the sample transport device 3 will be close to the S pole at the starting end or the destination end of the U-shaped rabbit pipe 10, thereby completing the positioning of the sample transport device 3, and the positioning is that when the sample transport device 3 reaches the destination from the starting end of the U-shaped rabbit pipe 10, its groove is exactly opposite to the opening of the U-shaped rabbit pipe (10), thereby facilitating the operation of the robot to take and place the target material.

[0029] Furthermore, the ventilation assembly includes a starting end air pressure chamber 1 arranged below the starting end of the U-shaped rabbit running pipe 10 for ventilating the sample transport device 3, a first transmission buffer spring 2, and a 7th detection signal 17 and an 8th detection signal 18; when the sample transport device 3 is in the starting end air pressure chamber 1 position, the signal feedback lights of the 7th detection signal 17 and the 8th detection signal 18 are always on, indicating that the sample transport device 3 is in the starting end air pressure chamber 1 position and has been positioned; when the starting end air pressure chamber 1 is ventilated, the sample transport device 3 starts from the starting end air pressure chamber 1 end of the U-shaped rabbit running pipe 10. At this time, the signal feedback lights of the 7th detection signal 17 and the 8th detection signal 18 are off, indicating that the sample transport device 3 starts normally.

[0030] Further, the deceleration component includes: a destination air pressure chamber 9 arranged below the destination end of the U-shaped rabbit running pipe 10 for decelerating the sample transport device 3, a second transmission buffer spring 8, and a fifth detection signal 15 and a sixth detection signal 16; the multiple sensor components include: detection signal 4, detection signal 5, detection signal 6, and detection signal 7 arranged at intervals in the bend of the U-shaped rabbit running pipe 10;

[0031] A passing signal is sent out through the detection signal 5, indicating that the sample transport device 3 passes the curve normally; when the sample transport device 3 passes through the detection signal 6, a passing signal is sent out, and the air pressure chamber 1 at the starting end stops ventilation, and the sample transport device 3 will continue to move under inertia; when the sample transport device 3 passes through the detection signal 7, a passing signal is sent out, and the air pressure chamber 9 at the destination end gives the falling sample transport device 3 an upward airflow, and the upward airflow further decelerates the sample transport device 3 until it lands on the buffer seat formed by the second transmission buffer spring 8. At this time, the fifth detection signal 15 detects that the sample transport device 3 has arrived, and its corresponding feedback light is on, and the air pressure chamber 9 at the destination end stops ventilation; then the sample transport device 3 starts to rotate under the combined action of the external magnetic field at the landing end and the magnet inside the sample transport device 3 until it stops. At this time, the feedback light of the sixth detection signal 16 is on, indicating that the positioning is completed, and the next manipulator operation can be performed.

[0032] Furthermore, in order to prevent the sample transport device 3 from getting stuck in the U-shaped rabbit running pipe 10, the feedback signals can be used to determine the position at which the sample transport device 3 is stuck, thereby reducing the maintenance processing time, and when the sample transport device 3 is stuck when moving from the starting end pressure chamber 1 to the destination end pressure chamber 9, the sample transport device 3 is withdrawn for maintenance by controlling the starting end pressure chamber 1 to cut off the air and the destination end pressure chamber 9 to ventilate; conversely, when moving from the destination end pressure chamber 9 to the starting end pressure chamber 1, the sample transport device 3 is withdrawn for maintenance by controlling the destination end pressure chamber 9 to cut off the air and the starting end pressure chamber 1 to ventilate.

[0033] Furthermore, the sample transport device 3 is cylindrical, and an upper SN magnet and a lower SN magnet are respectively provided on the upper end face and the lower end face of the cylindrical sample transport device 3. An opening is provided on the side of the cylindrical sample transport device 3, and the size of the opening matches the size of the target material storage box. The target material storage box is placed in the middle of the cylindrical sample transport device 3, and the upper and lower ends of the target material storage box are blocked from overflowing by spring blocking pins 20.

[0034] Embodiment 1

[0035] Below, we can assume a usage environment to calculate the deceleration of the sample transport device 3. For example, when the sample transport device 3 carries a total of 6 kg of target material, the area at both ends of the sample transport device 3 is about 0.00694 m2, and the gravity acceleration is about 9.8 m / s2. Assuming that the sample transport device 3 needs to rise 4 m, translate 10 m, and descend 4 m to complete the transportation, there is no additional friction during the rise and fall, and the friction coefficient during translation is about 0.1. Assuming that the speed of the sample transport device 3 when it rises to the top is 10 m / s (ignore the power loss in the curve), and the airflow leakage in the gap between the sample transport device 3 and the rabbit running tube is negligible, the relationship between the speed and the gas pressure can be calculated by the following formula.

[0036] When the sample transport device 3 starts from the starting end air pressure chamber 1 with a speed of 0 and rises to 4 m with a speed of 10 m / s, the calculation formula is:

[0037]

[0038] Among them, v1 is the speed when rising to 4m, that is, v1 = 10m / s; v0 is the initial speed, that is, 0; F is the thrust provided by the air pressure, G is the total weight of the sample transport device 3 and the target material, G = mg; h is the rising height of 4m; P is the gas pressure, and A is the end surface area of ​​the sample transport device 3. Substituting each value into it, it can be obtained that the air pressure intensity P required to accelerate the sample transport device 3 to 10m / s is about 12.795KPa.

[0039] When the sample transport device 3 rises to 4m, the air pressure chamber 1 at the starting end stops supplying air, and after completing the translation of 10m by inertia, it descends under the action of gravity. At this time, the air pressure chamber 9 at the destination end is ventilated to form a buffer for the sample transport device 3, so that it can reduce the impact strength when landing. The air pressure provided by the air pressure chamber 9 at the destination end can be calculated according to the formula;

[0040] calculate:

[0041]

[0042]

[0043] Among them, μ is the friction coefficient between the sample transport device 3 and the inner wall of the rabbit tube, which is about 0.1; s is the translation distance, which is about 10m; v2 is the speed after translation; P2 is the pressure provided by the air pressure chamber 9 at the destination end; v3 is the landing speed, which is about 0. It can be calculated by substituting it into the formula to obtain that the required air pressure intensity of the sample transport device 3 for a landing speed of 0 is about 11.948KPa.

[0044] In summary, the air supply pressure of the starting end pressure chamber 1 can be obtained according to formula (1) (2), and the air supply pressure of the destination end pressure chamber 9 can be obtained according to formula (3) (4), thereby controlling the transportation speed of the sample transportation device 3 and avoiding the risk of collision.

[0045] It should be emphasized that the above specific embodiments are merely explanations of the present invention, and they are not limitations of the present invention. After reading this specification, those skilled in the art can make modifications to the above embodiments without any creative contribution as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A pneumatic sample transport device based on deceleration and positioning, characterized in that: The device is composed of a positioning component and a deceleration component; the positioning component comprises a U-shaped rabbit running pipe (10) with an opening downward and one end as a starting end and the other end as a destination end, and a sample transport device (3) arranged in the U-shaped rabbit running pipe (10) for transporting target materials from one end to the other end; the U-shaped rabbit running pipe (10) and the sample transport device (3) are respectively provided with magnets that attract each other, and the positioning of the sample transport device (3) is completed under the action of magnetic force; the deceleration component comprises a ventilation component arranged at the starting end of the U-shaped rabbit running pipe (10), a deceleration component arranged at the destination end of the U-shaped rabbit running pipe (10), and a plurality of sensor components arranged in the bend of the U-shaped rabbit running pipe (10); through the organic cooperation of the ventilation component, the deceleration component, and the plurality of sensor components, process control is realized to achieve the purpose of deceleration and collision avoidance; In the deceleration pneumatic transmission area, the air cut-off of the starting end air pressure chamber (1) and the air supply of the destination end air pressure chamber (9) are combined, and gravity and the reverse thrust airflow of the destination end air pressure chamber (9) are combined, so as to achieve the purpose of deceleration and avoid damage to the equipment, sample transport device (3) and samples caused by severe impact; The U-shaped rabbit running pipe (10) and the sample transport device (3) are respectively provided with magnets that attract each other, specifically: an S-pole magnet (13) and an N-pole magnet (14) are respectively provided on both sides of the starting end and the destination end of the U-shaped rabbit running pipe (10), and an upper SN magnet (11) and a lower SN magnet (12) are respectively provided at the upper and lower ends of the sample transport device (3); the S-pole of the sample transport device (3) will be close to the N-pole at the starting end or the destination end of the U-shaped rabbit running pipe (10), and the N-pole of the sample transport device (3) will be close to the S-pole at the starting end or the destination end of the U-shaped rabbit running pipe (10), thereby completing the positioning of the sample transport device (3), and the positioning is that when the sample transport device (3) reaches the destination from the starting end of the U-shaped rabbit running pipe (10), its groove is exactly opposite to the opening of the U-shaped rabbit running pipe (10), thereby facilitating the operation of the robot to take and place the target material.

2. A pneumatic sample transport device based on deceleration and positioning according to claim 1, characterized in that: The ventilation assembly comprises a starting end air pressure chamber (1) arranged below the starting end of the U-shaped rabbit running pipe (10) for ventilating the sample transport device (3), a first transmission buffer spring (2), and a seventh detection signal (17) and an eighth detection signal (18); when the sample transport device (3) is at the starting end air pressure chamber (1) position, the signal feedback lights of the seventh detection signal (17) and the eighth detection signal (18) are always on, indicating that the sample transport device (3) is at the starting end air pressure chamber (1) position and has been positioned; when the starting end air pressure chamber (1) is ventilated, the sample transport device (3) starts from the starting end air pressure chamber (1) end of the U-shaped rabbit running pipe (10), at which time, the signal feedback lights of the seventh detection signal (17) and the eighth detection signal (18) are off, indicating that the sample transport device (3) starts normally.

3. A pneumatic sample transport device based on deceleration and positioning according to claim 1, characterized in that: The deceleration component comprises: a destination air pressure chamber (9) arranged below the destination end of the U-shaped rabbit running pipe (10) for decelerating the sample transport device (3), a second transmission buffer spring (8), and a fifth detection signal (15) and a sixth detection signal (16); the plurality of sensor components comprise: a first detection signal (4), a second detection signal (5), a third detection signal (6), and a fourth detection signal (7) arranged at intervals in the bend of the U-shaped rabbit running pipe (10); A passing signal is sent out through the second detection signal (5), indicating that the sample transport device (3) passes the curve normally; when the sample transport device (3) passes through the third detection signal (6), a passing signal is sent out, and the air pressure chamber (1) at the starting end stops ventilation, and the sample transport device (3) continues to move under inertia; when the sample transport device (3) passes through the fourth detection signal (7), a passing signal is sent out, and the air pressure chamber (9) at the destination end gives the falling sample transport device (3) an upward airflow, and the transport device is further decelerated by the upward airflow until it lands on the buffer seat formed by the second transmission buffer spring (8), at which time the fifth detection signal (15) detects that the sample transport device (3) has arrived, and its corresponding feedback lamp is lit, and the air pressure chamber (9) at the destination end stops ventilation; then the sample transport device (3) starts to rotate under the combined action of the external magnetic field at the landing end and the magnet in the transport device until it stops, at which time the feedback lamp of the sixth detection signal (16) is lit to indicate that positioning is completed, and the next robot operation can be performed.

4. A pneumatic sample transport device based on deceleration and positioning according to claim 1, characterized in that: In order to prevent the sample transport device (3) from getting stuck in the U-shaped rabbit running pipe (10), the position of the transport device can be judged by various feedback signals, thereby reducing the maintenance processing time. When the transport device is stuck while moving from the starting end pressure chamber (1) to the destination end pressure chamber (9), the sample transport device (3) is returned for maintenance by controlling the starting end pressure chamber (1) to cut off the air and the destination end pressure chamber (9) to ventilate. Conversely, when moving from the destination end pressure chamber (9) to the starting end pressure chamber (1), the sample transport device (3) is returned for maintenance by controlling the destination end pressure chamber (9) to cut off the air and the starting end pressure chamber (1) to ventilate.

5. A pneumatic sample transport device based on deceleration and positioning according to claim 1, characterized in that: The sample transport device (3) is cylindrical, and an upper SN magnet and a lower SN magnet are respectively provided on the upper end surface and the lower end surface of the cylindrical sample transport device (3). An opening is provided on the side of the cylindrical sample transport device (3), and the size of the opening matches the size of the target material storage box. The target material storage box is arranged in the middle of the cylindrical sample transport device (3), and the upper and lower ends of the target material storage box are blocked from overflowing by spring blocking pins (20).

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